Question about 1993 Chevrolet Lumina

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Spark occasionally Help! I've spent the better part of two days breaking my bank and still can't get my Lumina 3.1 sedan running. My problem is no spark (although it shows up in the cool morning and then stops after warm). I replaced the ECM and ICM with same results. Prior to my breakdown, the car was trying to jump out of 4th gear when going up a hill but never would down shift. The speedo was acting eratically at the time the motor quit... so I replaced the ECM hoping it was making all of these components misbehave. I tested the coils and plug wires but all check OK. I tested the connectors to the ICM but all are OK. I've read and re-read my repair manual but am at wits end. Any suggestions?

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  • goingpostal Oct 18, 2008


    This is an elctronic ignition system. The codes were in the ECM and I replaced it. I did get the car running this morning but no codes have been stored in the new ECM.

  • goingpostal Oct 18, 2008

    If it will start, I'll try that. I don't have any spark now, from any coil, which makes me think its a short. But what do I know, I turn a wrench only when I have to. I'll try anything... need to get this X!:'!!xoeixx thing going by Monday.

  • jason May 11, 2010

    have you looked at the coil packs at night when it is acting up? you will see the sparks jumping on the coil pack at night.

    after the coil heats up , thats when it will start failing

    if you don't see sparks jump when its acting up , then you have a cam or crankshaft sensor failing

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Let me know what you get! and i'll be back to check with your diagnosis on that coil , then i'll help you pin point the culprit

thanks,
electech

Posted on Oct 19, 2008

  • jason Oct 19, 2008

    if the coil won't give you spark to the wires even when cool then it is probably done

    an example of arcing

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Check the main ignition relay first this is the cheapest solution.when the car is broke again check for 12 volt at the coils if not replace the relay.best of luck.

Posted on Oct 18, 2008

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Check that you have a good source of power to the ignition.If you have good power there pull coil/distributor lead out and crank you should have a good spark.and if not coil is at fault.If you have good spark from coil then check that diatributor is working.rotor cap and ignition module.If these test work out it should have a good spark and start.How old are the spark plugs and how did you test the leads?

Posted on Oct 18, 2008

  • tony yeatman
    tony yeatman Oct 18, 2008

    Can you pour a little water around the coil pack/coil when running if car stops therse your sign.

  • tony yeatman
    tony yeatman Oct 18, 2008

    Base of coil

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The number of problems you have would justify buying the code reader for the car. 
This is the lowest price I have seen for the one you need:
Equus 3123 Code Reader

Posted on Oct 18, 2008

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81eff27.jpg

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